Campbell Met One 034A-L Manual del operador Pagina 47

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47
Manual
Annexes
Annex 3.1: METSTAT Structure Diagram
Structure Diagram for METSTAT, a Datalogger Program for the Meteorological Stations established by GCP/RAF/304/
JPN and GCP/INT/752/ITA Projects Using Campbell Scientific CR10X Storage and Control Modules.
Interval = 1440 minutes (1day)
Interval = 60 minutes (1 hour)
Interval = 300 seconds (5 minutes)
Switch on CS500
“combined sensors for air temperature and RH”
Delay 0.02 seconds
“to allow the CS500 to heat up”
Measure
inp 1 AIR_T EMP [°C]
inp 2 RH [%]
Switch off CS500
“to save power”
Measure
inp 3 SOLAR -RAD [W/M^2]
inp 4 WIND_SPD [M/S]
inp 5 WIND_DIR [degrees]
inp 6 RAIN [MM]
Process
IF RH>100
T F
RH = 100 RH = RH
inp 7 SVP (AIR_TEMP)
“saturated vapor pressure as
function of air temperature [kPa]”
inp 8 VP = RH/100 * SVP
vapor pressure [kPa]”
inp 9 VPD = SVP - VP
“ vapor pressure deficit [kPa]”
“vapor pressure deficit is used in Penman based potential evaporation
estimation”
IF SOLAR_RAD < 0
T F
SOLAR_RAD = 0 SOLAR_RAD = SOLAR_RAD
“net. solar radiation is input in the Penman and Priestley-Taylor
based potential evaporation estimation”
inp 10 FM_SOLAR = 300 * SOLAR_RAD
“[J/m2, for 5 min]”
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